Ionia Weather Forecast

    • 36
    • 60

    Decreasing Clouds

    • 31
    • 55

    Partly Sunny

    • 36
    • 61

    Sunny

    • 43
    • 65

    Partly Sunny

    • 42
    • 65

    Mostly Cloudy

    • 39
    • 55

    Partly Sunny

Today 22 Oct Ontario

Partly to mostly sunny. Patchy fog this morning. Highs Ranging from the mid 50s on the Hilltops to around 60 across the lower Elevations. Light Winds, becoming north around 10 Mph.

Tonight 22 Oct Ontario

Mostly cloudy in the Evening, then clearing. Some patchy fog developing. Lows in the mid 30s. Light north Winds.

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Ionia Temperature Statistics

October Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 18 October, 2026

    33.8 °F

  • Average October

    56.2 °F

  • Highest 13 October, 2026

    82.7 °F

Climate (2021–2026)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.1 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    59.5 °F
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